Bush-hammer.



E. CAVICCHI.

BUSH HAMMER.

' APPLlATlON FILED MAR. 31| |913. 1,149,1 15')D Patented Aug. 3, 1915.

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ERGOLE CAVICCHI, OF QUINCY, MASSACHUSETTS.

BUSH-HAMMER.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Application filed March 31, 1913. Serial N0.' 757,801.

scription, in connection 4with the accomf panying drawing, is a specification, like characters on the drawing representing like arts.

p This invention relates to bush hammers and has for an object `toprovide a bush hammer which may be cheaply manufactured and which will be strong and durable.

Another object is to provide a bush hammer comprising a tool holder having a circular tapered recess and members including blades 'entirely filling said recess.

Another object is to provide a recessed tool holder, removable blades and filler members connected to some of the blades to move therewith so that these filler members cannot become loose and drop out.

In the drawing the preferred and best form of the invention is shown in which iiat blades are provided at the sides with fillers and the assembled Shanks and fillers are formed to present a cone which iits into a conical recess in the tool holder; thus the parts are securely held and the operation of the device causes the parts ofthe device to t more tightly. The construction is one which lends itself to cheap and easy manufacture the bits being made fiat and the assembled bits and llers being readily turned down to the desired shape.

The invention will be fully described in the following speciication taken in connection with the accompanying drawing and will be particularly pointed out in the claims.

Figure l is a view in elevation showing the device assembled and ready for use. Fig. 2 is a sectional view of the same taken on the line 2-2 of Fig. 3. Fig. 3 is a sectional view taken on the line 3 3 of Fig. 2. Fig. 4i is a similar view showing a modified form of iiller. Fig. 5 is a perspective view of the filler used in the construction shown in Fig. 3. Fig. 6 is a similar view of the filler used in the modification shown iny Fig. 4.

Referring to thek drawings in detail l indicates a tool holder having a tapered recess preferably circular in cross section which is adapted to receive blades or bits 2. It is notusually desirable to use a suhcient numberof bladesk to entirely fill the recess and iillers 3 may be provided so that the recess will be` entirely iilled. Eachller may be and preferably is so connected to or interlocked with the adjacent blade that relative movement is limited or prevented. This may be done by providing the ller 3 with a lug 4 as shown in Fig. 5 which is adapted to iit in a hole provided for this purpose in the adjacent blade. The blades and fillers are so shaped that when assembled they will fit in the recess in the tool holder.

In the modification shown in Fig. 4, the filler 5 is of a different shape, being recessed on its inner side so that the filler may yield or spring to a slight extent. It will be seen that in this construction the forces tending to distort the walls of the tool holder will be more evenly distributed. In assembling the device the blades 2 are placed side by side and the fillers 3 are placed in position adjacent the blades. The blades and fillers are then inserted in the recess in the tool holder, care being taken to keep the ends of the blades 2 even so that when assembled the edges of the blades 2 will all be in a plane perpendicular to the aXis of the tool holder. The blades are then forced into the tool holder until they wedge tightly therein and the tool is ready for use. In order to facilitate the removal of the blades, holes 6 are provided in the tool holder through which a pin may be inserted to drive out the fillers and the adjacent blades.

Obviously modifications may be made without departing from the spirit of the invention. v

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is r* l. A bush hammer comprising a tool holder having a circular tapered recess, a plurality of fiat blades having the edge surfaces of their assembled shanks shaped to conform to the shape of the circular tapered recess and a pair of iillers shaped to conform to the shape of the circularv tapered recess on their outer sides and recessed on the sides toward the blades in such a manner as to bear against the blades at their edges only.

2. A bush hammer comprising a tool holder having a circular tapered recess, a plurality of blades with the edge surfaces of their assembled Shanks tapered and curved I Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents. f

toconform tothe shape of the circular tapered recess whereby the assembled bladesy may be frictionally retained in said recess, a filler fitting against the blades and also tapered and curved to conform t0 the Vshape of the recess, whereby the assembled parts as a whole may be frictionally held in the recess.

3. A bush hammer Comprising a tool holder having a tapered recess, a plurality of blades with the edge surfaces of their asv sembled Shanks tapered to conform to the shape of the tapered recess whereby the assembled blades may be frictionally retained in said recess, a filler fitting against and connected to one of the bladeswhereby the assembled blades and ller may be frictionally retained in the recess.

4. A bush hammer comprising a tool faces of a similar conical conformation,

whereby kthe assembled blades and `fillers may be driven intoy and frictionally and securely held as a whole in said recess.

In testimony whereof, 'I have signed my name to this specification, in the presence of two subscribing witnesses.

' ERCOLE cAvrccni..

Witnesses B.' Gr.V MORRIS, FREDERICK S. GREENLEAF.

Washington, D. C. 

